1. Warm-Up (11/10)
Answer the following questions, and explain in a complete sentence why each answer is correct.
Bacteria living in a cow’s stomach help the cow break down the cellulose in grass, gaining nutrients in the process. What type of symbiosis is this, and why?
A. It is commensalism since the bacteria benefits but the cow does not.
B. Bacteria in a cow’s stomach is not a type of symbiosis.
C. It is a parasitism since the bacteria can harm the cow.
D. It is mutualism since both the cow and bacteria benefit.
What happens to chemical bonds during chemical reactions?
A. Chemical bonds can only be broken and not made.
B. The chemical bonds do not change.
C. The bonds change by either forming or breaking.
D. Chemical bonds can only be formed, but not broken.

2. Chemical Reactions Manipulative
Arrange the atoms to form the reactants of photosynthesis.
For example, create 6 CO2 molecules by pairing a C with two O’s, 6 times. Then rearrange the atoms to form the products.
Photosynthesis: 6CO2 + 6H2O  C6H12O6 + 6O2
Cellular Respiration: C6H12O6 + 6O2  6CO2 + 6H2O
Write these reactions in your notebooks!

3. Photosynthesis/Cellular Respiration Table
Create and fill in the table below.
Reaction
Reactants
Products
Location
Energy In
Energy Out
Photosynthesis
CO2 and H2O
C6H12O6 and O2
Chloro-plast
Light energy
C6H12O6
(Glucose)
Cellular Respiration
Mito-chondria
ATP
Question: why does a plant have to absorb CO2 in order to make glucose?
Answer: a plant has to absorb CO2 to make glucose because…

4. Think-Pair-Share What is being used up in cellular respiration?
Consider the following questions and share your answer with your partner. Feel free to use the sentence stem below. I will call on three people to give me their partners’ answers.
What is being used up in cellular respiration?
What is being produced?
In cellular respiration, _________ is used up and ____________ is produced.

5. Closure Answer the following question in a complete sentence:
Name
Date
Period
If you were in a plastic bag, why would you run out of O2?
Bonus: what would happen if there was a plant in there with you?
Scale from 1-10